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A woman who regularly complained of feeling ill at work and noticed a peculiar taste in her drinks had allegedly been poisoned by a co-worker for months.

Police arrested a 33-year-old man on Thursday in Maroubra, in Sydney's east, after the woman told officers of her suspicions, news.com.au reported.

The pair worked together in a Sydney pharmacy and while they had never been in a relationship, the man was "infatuated' with the 26-year-old, reported the ABC.

Police viewed CCTV footage which they say allegedly shows the woman's colleague pouring a liquid substance into her drink. The investigation was sparked on Wednesday when she reported suspicions that a colleague had placed drugs in her drinks.